Generally used to describe a video card capable of running two displays. Also used to describe a computer set up with two displays connected
This page has been created primarily to link to some notes on how to acheive the latter of these two definitions
There are basically two ways to acheive a dual head setup, you need either a DualHead video card (a video card that supports 2 displays), or use two cards to run the two displays (ie one display each).
For an example of dual-head using Xinerama, (with the Intel i810/i915 graphics chipset + driver), see i915-xorg.conf.
Nvidia based cards use their own method - see TwinView.